Pinion shaft and method of making



June 25, 1929. R. B. WEEKS 1,718,721

PINION SHAFT AND METHD 0F MAKING Filed may 5, 1927 n J8 l? 7 f "W" 'A Patented lune 25, 1929.

UNITED sTATEs PATENT OFFICE.

RAY B. "WEEKS, OF CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE WAYNE PUMP COMPANY, OF BALTIMORE, MARYLAND, A CORPORATION OF MARY- LAND.

PINION SHAFT AND METHOD OF MAKING.

Application filed May 5, 1927. Serial No. 189,122.

rThe invention pertains to a dispensing apparatus, and more particularly to a no vel pinion shaft to be used in a iiuid dispensing pump.

1n the usual integral pinion shaft for a device such as a dispensing/il pump, it is usual to machine a blank or steel shaft in a number of stages and to cut pinion teeth in a certain stage thereof, using other stages7 With or Without bearing sleeves, as bearings. This is objectionable as it is expensive to manufacture, and as the grain of the steel runs length Wise of the teeth, a weaker tooth is produced than if the grain thereof ran radially.

lt is, therefore, an object of this invention to produce a pinion shaft. for cooperating with the pump rack, Which is of integral structure, yet is inexpensive to nnuiufacture.

Another object is to produce a pinion shaft with a bearing of larger surface Without necessarily increasing` the shaft diameter per se.

A further object is to manufacture an integ-ral pinion shaft whereby the pinion may beY cut from an upset portion of the shaft,

thereby insuring an integral and stronger` structure.

A still further object is to manufacture a pinion and shaft whereby the grain of the steel in the gear teeth runs radially, from the root of the teeth to the tip, thereby more effectively resisting breaking than in the case Where the grain runs parallel to the axis of the shaft.

jiillith these and kVarious other objects in view7 the invention may consist of certain novel features of construction and operation, as will be .more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

ln the drawings which illustrate an embodiment of the device, and wherein like reference characters are used to designate like parts,

Figure 1 is a sectional elevation of a fluid dispensing pump embodying the invention;

Figure 2 is a partial'sectional elevation taken through the upper cylinder head or pinion housing and showing the rack an d pinion bearings and guides;

Figure Sie a sectional plan of the rack `showing' the enlargement of the shank or shaft portion;

Figure 7 is a longitudinal elevation of the pinion blank after cutting the teeth on the upset portion and machining the shanks to correct size;

Figure 8 is a longitudinal elevation of the pinion blank illustrated in Figure 7, after the bearing collar has been secured or shrunk on a portion of the shank.

Referring first of all to one application of the pinion shaft, the usual oil pump 1 provided With the inlet 2, from a supply reservoir, and the outlet 8 disposed conveniently above the drip pan 4f, is provided With a pump or piston cylinder 5 which acts a guide, and a reservoir on the up stroke of the piston 6, said piston an d cylinder being provided with the usual one-Way valves. he piston 6 is adapted to be actuated by the usual handle 7 attached by means of the nut 7a to the pinion shaft 14 carried in convenient bearings 12 and 13` in the upper cylinder head S attached to and supported by the piston cylinder reservoir 5.

Cooperating with the pinion and attached to the piston is a rack 10j formed on a cylindrical bar, which slides in a suitable guide l1 formed in the head adjacent the bearings 12 and 13. The pinion shaft 111 is provided with a bearing surface 19 adapted to lit in a suitable opening or bearing surface in the bearing 127 this bearing surface 19 being adjacent the pinion teeth 15 and disposed at one end of the shaft. A sleeve 18 is forced on the shaft 11iand is disposed adjacent the' teeth 1.5 on the opposite side to the bearing surface 19'and is adapted to turn in the bearing 13. rlhe bearing 13 is provided with a suitable threaded portion for taking the positioning and bearing member` 16. Be-

tween the member 16 and the sleeve 18, there v may be provided any packing, such as indicated at 17.

In manufacturing this pinion shaft arrangement, it has been found convenientto use a suitable rod or Wire Q5, upsetting a portion 26 thereof at the desired place as adjacent one end, which upsetting operation, it Will be understood, slightly increases the two ends'SO and 31 above their normal size which may be illust-rated by the upset and final diameters 27 and 28. This necessitates a turning operation, a certain amountof metal being removed all over to reduce the diameter of the shaft to the Working diameter 28. The teeth 29 are cut in the upset portion 26 of the pinion shaft in the usual manner on a gear hob. The sleeve 18 is then forced on one end of the shaft. and disposed adjacent the teeth 15 in order to givey a larger bearing surface. It is, of course, to be underst-ood that this sleeve, which may be of .slightly larger diameter than the outside diameter ofthe teeth, may be formed integral with the pinion shaft although it has been found more convenient to use a separate sleeve. It has further been found thatin forming the teeth in the above manner that lthe ygrain in the teeth is disposed in a direction from the root to the tip and not in vthe ydirection of the axis or longitudinal 'f center line lof the shaft, therebj7 increasing the strength of the member, which may allow smaller parts to be used for the same stresses to be encountered.

Itis to be understood that I do not Wish to be limited by the embodiment shown of the device, Which is merely by Way of illustration and not limitation, as various and other forms of the device Will, of course, be apparent to those skilled in the art, Without departing from the spirit of the invention or the scope of the claims.

I claim:

1. The method of forming a pinion shaft, which includes upsetting a portion of said shaft, cutting teeth on said upset portion, and positioning a bearing adjacent said teeth, said bearing having an outside diameter' at least as great as the outside diameter of the teeth.

2. The method of forming a pinion shaft, which includes upsetting a portion of said shaft, cutting teeth on said upset portion, machining said shaft, and positioningr a bearing adjacent said teeth, said bearing having an outside diameter at least as great as the outside diameter of the teeth.

The method of forming a pinion shaft, which includes upsetting a portion thereof, cutting teeth on said upset portion, and providing a bearing on said shaft adjacent said teeth, said bearing having an outside dialneter at least as large as the outside diameter of said teeth.

1. The method of forming a pinion shaft which includes upsetting a portion thereof, cutting teeth on said upset portion, and providing bearings on said shaft, at least one of said bearings having an outside diameter at least as large as the outside diameter of said teeth.

5. In a pinion arrangement the eomhination of a cylindrical portion having an upset portion therein, teeth formed in said upset portion and a sleeve secured to said eylin` drical portion adjacent said teeth, the diameter of said sleeve being at least as great as the diameter of said teeth.

Signed at Cleveland, Ohio, this twentyfifth day of April, 1927.

RAY B. IVEEKS. 

